The FBI investigation into Hillary Clinton’s use of private email as secretary of state has expanded to look at whether the possible “intersection” of Clinton Foundation work and State Department business may have violated public corruption laws, three intelligence sources not authorized to speak on the record told Fox News.

This track is in addition to the focus on classified material found on Clinton’s personal server.

“The agents are investigating the possible intersection of Clinton Foundation donations, the dispensation of State Department contracts and whether regular processes were followed,” one source said.

The development follows press reports over the past year about the potential overlap of State Department and Clinton Foundation work, and questions over whether donors benefited from their contacts inside the administration.